AdGuard is an ad blocking service for Microsoft Windows, Linux, MacOS, Android and iOS.

[1] AdGuard Home acts as a recursive DNS resolver, which prevents most advertisements from displaying by responding with an invalid address for domains that appear in its filter lists.

It downloads filter list updates and requests browsers to enforce them via Content Blocker API.

[16] Subsequently Microsoft and Google were alerted and actions were taken to remove the fake add-ons in the various browser stores.

[17] AdGuard developers have taken up research in order to inform wider audiences on user privacy, cybersecurity and data protection.